Deng-Cheng Zhu | da615cf | 2014-01-01 16:29:03 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved. |
| 7 | * Copyright (C) 2013 Imagination Technologies Ltd. |
| 8 | */ |
| 9 | #include <linux/device.h> |
| 10 | #include <linux/fs.h> |
| 11 | #include <linux/err.h> |
| 12 | #include <linux/wait.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/smp.h> |
| 15 | |
| 16 | #include <asm/mips_mt.h> |
| 17 | #include <asm/vpe.h> |
| 18 | #include <asm/rtlx.h> |
| 19 | |
| 20 | static int major; |
| 21 | |
| 22 | static void rtlx_interrupt(void) |
| 23 | { |
| 24 | int i; |
| 25 | struct rtlx_info *info; |
| 26 | struct rtlx_info **p = vpe_get_shared(aprp_cpu_index()); |
| 27 | |
| 28 | if (p == NULL || *p == NULL) |
| 29 | return; |
| 30 | |
| 31 | info = *p; |
| 32 | |
| 33 | if (info->ap_int_pending == 1 && smp_processor_id() == 0) { |
| 34 | for (i = 0; i < RTLX_CHANNELS; i++) { |
| 35 | wake_up(&channel_wqs[i].lx_queue); |
| 36 | wake_up(&channel_wqs[i].rt_queue); |
| 37 | } |
| 38 | info->ap_int_pending = 0; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | void _interrupt_sp(void) |
| 43 | { |
| 44 | smp_send_reschedule(aprp_cpu_index()); |
| 45 | } |
| 46 | |
| 47 | int __init rtlx_module_init(void) |
| 48 | { |
| 49 | struct device *dev; |
| 50 | int i, err; |
| 51 | |
| 52 | if (!cpu_has_mipsmt) { |
| 53 | pr_warn("VPE loader: not a MIPS MT capable processor\n"); |
| 54 | return -ENODEV; |
| 55 | } |
| 56 | |
| 57 | if (num_possible_cpus() - aprp_cpu_index() < 1) { |
| 58 | pr_warn("No TCs reserved for AP/SP, not initializing RTLX.\n" |
| 59 | "Pass maxcpus=<n> argument as kernel argument\n"); |
| 60 | |
| 61 | return -ENODEV; |
| 62 | } |
| 63 | |
| 64 | major = register_chrdev(0, RTLX_MODULE_NAME, &rtlx_fops); |
| 65 | if (major < 0) { |
| 66 | pr_err("rtlx_module_init: unable to register device\n"); |
| 67 | return major; |
| 68 | } |
| 69 | |
| 70 | /* initialise the wait queues */ |
| 71 | for (i = 0; i < RTLX_CHANNELS; i++) { |
| 72 | init_waitqueue_head(&channel_wqs[i].rt_queue); |
| 73 | init_waitqueue_head(&channel_wqs[i].lx_queue); |
| 74 | atomic_set(&channel_wqs[i].in_open, 0); |
| 75 | mutex_init(&channel_wqs[i].mutex); |
| 76 | |
| 77 | dev = device_create(mt_class, NULL, MKDEV(major, i), NULL, |
| 78 | "%s%d", RTLX_MODULE_NAME, i); |
| 79 | if (IS_ERR(dev)) { |
Sebastien Bourdelin | 0435b13 | 2014-06-19 16:30:23 -0400 | [diff] [blame] | 80 | while (i--) |
| 81 | device_destroy(mt_class, MKDEV(major, i)); |
| 82 | |
Deng-Cheng Zhu | da615cf | 2014-01-01 16:29:03 +0100 | [diff] [blame] | 83 | err = PTR_ERR(dev); |
| 84 | goto out_chrdev; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | /* set up notifiers */ |
| 89 | rtlx_notify.start = rtlx_starting; |
| 90 | rtlx_notify.stop = rtlx_stopping; |
| 91 | vpe_notify(aprp_cpu_index(), &rtlx_notify); |
| 92 | |
| 93 | if (cpu_has_vint) { |
| 94 | aprp_hook = rtlx_interrupt; |
| 95 | } else { |
| 96 | pr_err("APRP RTLX init on non-vectored-interrupt processor\n"); |
| 97 | err = -ENODEV; |
| 98 | goto out_class; |
| 99 | } |
| 100 | |
| 101 | return 0; |
| 102 | |
| 103 | out_class: |
| 104 | for (i = 0; i < RTLX_CHANNELS; i++) |
| 105 | device_destroy(mt_class, MKDEV(major, i)); |
| 106 | out_chrdev: |
| 107 | unregister_chrdev(major, RTLX_MODULE_NAME); |
| 108 | |
| 109 | return err; |
| 110 | } |
| 111 | |
| 112 | void __exit rtlx_module_exit(void) |
| 113 | { |
| 114 | int i; |
| 115 | |
| 116 | for (i = 0; i < RTLX_CHANNELS; i++) |
| 117 | device_destroy(mt_class, MKDEV(major, i)); |
Deng-Cheng Zhu | eee5794 | 2014-02-28 10:23:02 -0800 | [diff] [blame] | 118 | |
Deng-Cheng Zhu | da615cf | 2014-01-01 16:29:03 +0100 | [diff] [blame] | 119 | unregister_chrdev(major, RTLX_MODULE_NAME); |
Deng-Cheng Zhu | eee5794 | 2014-02-28 10:23:02 -0800 | [diff] [blame] | 120 | |
| 121 | aprp_hook = NULL; |
Deng-Cheng Zhu | da615cf | 2014-01-01 16:29:03 +0100 | [diff] [blame] | 122 | } |